since you a PBD and PBO type based deck my advice is:
remove the 3 rugos
add two more nullity and one more perfect guard
remove one dordona
add one more nemain (her skill is needed plus shes a good sacrifice for PBD)

please recheck the number of triggers on your deck, i was going to give you good however when i counted the triggers you have 17 triggers all in all and the rules only allow you to have 16 hope you change your deck build

oh just an advice: build a deck for one unit so that its combo and chain will be more efficient ^^

**P.S. Tell me how the changes work out for you if you decide to change them ok? >.<

my answer for q1:
3 negates have been doing great for me almost have them everytime XD and thats no joke, also i only have three because i dont really want to throw any card away, and yes even if it is for a perfect guard, normally i will only use them agains ezel or other wicked lb.

my answer for q2:
garmore is great however ezel is there for secondary vanguard if ever i wont be able to do my chain and lets face it ezel lb and skill are superior to garmore.

my answer for q3:
i only need vivian skill if ever my hand "*censored: not good*", she's a good g2 and i actually like people guarding against her and tripp... those two are my "guard breakers"

*** i doubt i'll be changing much unless i see another new combo which is why i like fighting great players to learn more XD ***